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Fig. 3. Total interaction energy (Vtotal) as calculated with Derjaguin–Landau–Verwey–Overbeek (DLVO) theory as a combination of electrostatic double layer (VEDL) and van der Waals (VVDW) forces between E. coli and C. jejuni and the quartz sand surface at 10 mM KCl. Calculations assume sphere–plate interactions (Gregory, 1981; Hogg et al., 1966) and a Hamaker constant of 6.5 x 10–21 J (Redman et al., 2004), and utilized a zeta potential value for quartz previously reported (Walker et al., 2002).
